83 lines
2.3 KiB
Nix
83 lines
2.3 KiB
Nix
{ config, lib, pkgs, ... }:
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let
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borg = "${pkgs.borgbackup}/bin/borg";
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backup_paths = lib.unique config.modules.system.backups.paths;
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passwd_file = config.sops.secrets."borg_passwd".path;
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in
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{
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options.modules.system.backups = {
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paths = lib.mkOption {
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type = lib.types.listOf lib.types.path;
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default = [];
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description = "list of directories to back up";
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};
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repo = lib.mkOption {
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type = lib.types.path;
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default = "/holocron/borg";
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description = "borg repository path";
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};
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passphraseFile = lib.mkOption {
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type = lib.types.path;
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default = passwd_file;
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description = "borg repository passphrase file";
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};
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};
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config = lib.mkIf (backup_paths != []) {
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systemd.services.borg-backup = {
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description = "BorgBackup service for system data";
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serviceConfig = {
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Type = "oneshot";
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EnvironmentFile = config.modules.system.backups.passphraseFile;
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ExecStart = pkgs.writeShellScript "borg-backup" ''
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set -euo pipefail
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export BORG_PASSPHRASE="$(cat ${passwd_file})"
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export BORG_REPO="${cfg.repo}"
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# Initialize repo if it doesn't exist
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if ! borg info "$BORG_REPO" >/dev/null 2>&1; then
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echo "init borg repo at $BORG_REPO"
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borg init --encryption=repokey "$BORG_REPO"
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fi
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# Create backup
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echo "starting backup..."
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borg create \
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--verbose \
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--filter AME \
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--list \
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--stats \
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--show-rc \
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--compression lz4 \
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"$BORG_REPO::$(hostname)-$(date +'%Y-%m-%dT%H:%M:%S')" \
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${lib.concatStringsSep " " cfg.paths}
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# Prune old backups according to retention policy
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echo "Pruning old backups..."
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borg prune -v --list "$BORG_REPO" \
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--keep-daily=7 \
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--keep-weekly=52 \
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--keep-monthly=-1
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echo "Backup completed successfully."
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'';
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};
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};
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systemd.timers.borg-backup = {
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description = "daily borg backup timer";
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wantedBy = [ "timers.target" ];
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timerConfig = {
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OnCalendar = "daily";
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Persistent = true;
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};
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};
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environment.systemPackages = [ pkgs.borgbackup ];
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};
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}
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# add to modules
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# modules.system.backups.paths = lib.mkIf cfg.backups [ <path> ];
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